C

Bill payment or invoicing services for telephones, namely, printing and issuance of call charge bills and summaries of calls and charges; computerized data base preparation and management of client information, such as names, addresses, phone numbers, services available, states of equipment, and states of use of services; computerized data base preparation and management for managing client's negotiating states; telephone answering services in the nature of complaint answering and responding for others; billing; bookkeeping; accounting services; computerized data base preparation and management of personnel information; salary information management services; inventory information management; and business management of telephone exchange control services; management of computer database systems